Steam-generator.



W. T. HARRIS.

STEAM GENERATOR. APPLICATION FILED JULY 21, 1911. 11,179,627. PatentedApr. 18, 1916.

3 SHEETS-SHEET l.

I I m'zzzkmzvmrmsy,

w. 1. HARRIS. STEAM GENERATOR.

APPLICATION FILED JULY 21,1911.

Patented Apr. 18,

3 SHEETS-SHEET 2- vvi/tweooeo WILLIAM r. HARRIS, or s'rauurou,

srnAn-enmnnron.

To all-whom it may concern:

Be it known that 1, WILLIAM T. HARRIS, a citizen of the United States,residing at Staunton, in the county of Augusta and State of Virginia,have invented certain new and useful Improvements in Steam-Gener ators,of which the following is a specification.

My said invention consists in various improvements in the constructionof steam boilers especially designed for use on locomotives, wherebysubstantially perfect combustion is secured and a'comparatively highdegree of steam pressure thereby generated by a minimum supply of fueland "arious other important advantages secured, all as 'will behereinafter more fully described and claimed.

' Referring to the accompanying drawings which are made a part hereofand on which similar reference characters indicate similar parts, Figure1 is a longitudinal section through a steam generator of my improvedconstruction applied to a locomotive, Fig. 2 a, horizontal sectionthrough the same .on the dotted line 2-2 in Fig. 1, Fig. 3 alongitudinal vertical section on the dotted line in Fig. 2, Fig. 4 across section on the dotted line 4-4 in Fig. 1, Fig. 5 a cross sectionon the dotted line 55 in Fig. 1, and Fig. 6 a. cross section on thedotted line 6-6 in Fig. 1.

said drawings the portions marked A represent the. outer shell of thegenerator or boiler, B thecombustion chamber and C aninner shell or fluestructure leading from the combustion chamber to the smoke-box. Theboiler A may be a locomotive boiler, such as showmprovided with a steamdome a, smoke-box AL" and smoke-stack a, and other ordinary features of'construction, or it may be a boiler of any other form. Thecombustionchamher B is 'also in the main of.any approved form providedwith grate bars 6, a 'fuel supply door 7) and other common features ofconstruction. It is mounted in the rear end of the boiler and supportedby means of suitable braces and supporting; parts. Theflue C comprises ahollow shell preferably rectangular. in form with hell-shaped circularends 0 aud o provided with flanges .lilllch we r w ia 11 s nd a gSpecification of Letters Patent.

A, connected.

6 in the front end of the combustion charm her, and a? in the front endof the boiler, respectively. By constructing the ends a and 0 outwardlyflaring, the'gases leaving the main combustion chamber are directed intothe flue of the inner casing, and at the forward end of this flue (i. e.at the end 0') the gases are freely liberated for entrance into thesmoke box. This arrangement avoids the baflling elfect that would bepro= duced if the ends of the inner, flue were square. It will be notedthat by reason of this construction the removal of the rivets connectingsaid flue with said flanges b and a will permit the removal of theentire flue structure C, and all parts thereby, through the front end ofthe boiler, or, by

the cutting of the rivets connecting the Patented Apr. is, rare.

Application filed July 21, 1911. Serial No. 689,851.

front end of flue C with the flange a and the bolts securing the rearend A of boiler A in position, said flue and combustion chamber may bemoved as a body from said boiler. Said flue C is provided with numerousvertical tubes 10 which extend through its top and bottom in transverserows near each other from oneend of said flue to the other, the tubes inthe adjacent rows being set staggered in relation to each other. By thismeans free water circulation is established through said tubes 10 fromthe lower tothe upper part of boiler Aand the passage through flue C isobstructed by the vertical tubes so that the heat and other products aserpentine ,course, wrapping around the various vertical tubes in theirpassage through said flue. 'The front end of fine C is filled with aseries of coils 11. extending vertically and corresponding inarrangement to the tubes 10 but connected in series bysuitable couplingsboth above and below the flue to form a continuous passage throughsaidcoils. An inlet pipe 12 is connected with one end of said coils andan outlet pipe 13 with the opposite end. Said inlet pipe 12 is connectedby a branch feed pipe 14 with the water tank on the locomotive throughwhich the water is fed from said tank and passes through said coils 11,where it is heated and from which it is discharged through pipe 13 andnozzle 15 into boiler A. A check valve 16 is mounted beof combustion arerequired to take 1 the outside of the boiler which may be removed Whenrequired to establish communi-' cation with the coil for cleaningpurposes. Said flue C is preferably braced with a series of flangedirons riveted to its sides to afford the required resistance to theexterior pressure. v

Within the combustion chamber B I also provide an auxiliary steamgenerator 20 comprising a shell which forms a partition extendingtransversely of said combustion chamber a distance above the grate barsand preferably inclined from the rear of said combustion chamberdownwardly toward its 'front end. Said shell is provided with verticaltubes 21 through which the products of combustion may pass from be-. lowto above said shell. A water inlet pipe 22 extends from the lower partof boiler A to the front. end of said auxiliary boiler 20 and an'outletpipe 23 extends from the rear end of said. auxiliary boiler through theend of boiler A, then to a oint near the top of said boiler, Where itischarges through a nozzle 24, thus establishing a completecirculation'through said auxiliary boiler from v the lower side ofboiler A to its top.

' Air supply funnels 25 and26 are mounted on the sides ofv the cab withfunnel shaped forward ends'and their rear ends turned and insertedthrough suitably formed open ings in the rear end of boiler A, thusbeing arranged to discharge in'imediately above the rear end ofauxiliary boiler 20 in the combustion chamber.

The smoke-stack. a is formed with an inner tube 30 of smaller'diameterthus providing an annular space between them. Said annular spaceterminates in channels 31 and 32 which extend down aroundthe front endof boiler A where they are joined by an L 33 and connected to arearwardly extending funnel 34 which extends to a point rear- Wardlybeneath the locomotive, for a purpose to be presently described.

In the top of smoke-stack-a is pivoted a valve 35 which is adapted to beoperated -from the cab by a handle 36 on an operating rod 37 connectedby suitable links and levers with the pivot of said valve.

The operation of my said invention is as follows: The products ofcombustion passing through the vertical flues 21 of the auxiliarygenerator 20 commingle with the air, coming through funnels 25 and 26,in the combustion chamber above said auxiliary generator and burnfreely, filling said combustion chamber with flame of intense heat,which passes through the flue C, being to the smoke-box and up throughthe smoke stack strike a deflector -10 located over the inner tube 30 ofsaid smoke-stack and are deflected downwardly through the annular spacebetween said tube 30 and smoke-stack.

a into the passages 31 and 32 and are discharged out through the funnel34. In passing through tunnels, stations and other places where it isdesired to confine the gases and smoke as much as possible, the valve 35may be closed when all of theproducts' of combustion which ordinarilypass throu h thesmoke-stack'will be required to take t e as towthe heatin the boiler A surrounding flue structure C and its circulation tubes10. By this means not. only is the heating capacity of the structurefully utilized but substantially perfect combustion is secured and allof the heat of the fuel also utilized and thus the greatest degree ofsteam pressure is generated by the use of the smallest.

possible amount of fuel.

In addition to the advantages above pointed out a generator is providedwhich is comparatively easy to clean and to repair. The flue structure Ccan be easily and quickly removed as a whole for the pur pose of puttingin new tubes or stopping leaks. Said flue structure being a considerabledistance above the bottom of the boiler is out of th( wayof the ordinaryaccumulation of m1? 1, which settles on the bottom of said boiler andmay be removed, through an aperture left for the purpose and covered byaplate a Having thus fully described my said invention, what I claim asnew and desire to secure by Letters Patent, is: v i

1. A steam generator comprising an outer shell, an inner shell providinga flue, a .plurality of water tubes passing through said flue andsecured thereto, and certain of said tubes connected in series andcommunicatin with the water supply providing a feed waterheater,substantially as set forth.

7 2. A steam generator comprising an outer shell, an inner shelldisposed horizontally in the outer shell and providing a combustionchamber and a flue, a plurality "of open ended water tubes passingtransversely through said flue for a portion of its length,

and a series of connected water tubes passing transversely through theflue and communiceting with the source of water supply and the interiorof said outer shell, substantially as set forth,

In witness whereof, I have hereunto set my hand and; seal at Washington,Dis- WILLIAM '1. HARRIS 1,. 8.

Witnesses:

E. W. BRADFORD, J. D. YOAKLEY.

